Manufacture of articles adapted to resist abrasion



'Nov. 20, 1928. R. s. EDMONDSON ET AL MANUFACTURE OF ARTICLES ADAPTED TO RESIST ABRASION Filed Feb. 9' 1926 .fl'g j' I Patented Nov. 20,

UNITED STATES RALPH s. EDMONDSON, or EIiIzABErH, NEW JERSEY,

I 11,692,725 PATENT OFFICE." I

AND EUGENEHAHN, OF PHIL- ADELPHIA, PENNSYLVANIA, ASSIGNORS TO AMERICAN ABRASIVE METALS COM- PANY, A CORPORATION OF NEW YORK.

MANUFACTURE OF ARTICLES ADAPTED TO RESIST ABRASION.

Application filed February 9, 1926. Serial No. 87,019. I

oxides of aluminum and the carbids of silicon,

known to the trade under various names.

In making a metal casting with wear-resisting lumps embedded therein, the practice of the art has been to attach such lumps to the appropriate surface of a sand mold with adhesive material which would prevent the displacement of the lumps by the molten metal flowing into the mold. When, however, it was attempted to follow this practice in connection with a chill mold, that is, a mold provided with a metal or cast iron chill section, the adhesive material would not adhere to the metallic surface of the mold, so that when the molten metal was poured into 1 the mold, the lumps of wear-resisting material would be dislodged from their proper positions, or float to the top, thus rendering the casting useless for the purpose for which it was intended.

a These and other diificulties are obviated by the present invention, which contemplates a mold having a chill section of such character that the wear-resisting elements may be affixed thereto so securely that they will re- 5 tain their places despite the disturbing influence of the flowing molten metal. This is accomplished specifically by forming recesses in the chill section at the desired places and then filling these recesses with core sand,

1 which is dried or baked therein. The lumps of wear-resisting material may then be anchored to the sand fillings by means of a suit able adhesive in the same way as in the case of the ordinary sand mold.

i In the accompanying drawings, which are referred to herein and form a part hereof, are illustrated two molds prepared in accord ance with certain features of the invention together with the products produced from the molds in accordancewith certain other features of the invention.

Of the drawings:

Fig. 1 is a vertical longitudinal section of a mold for producing a plain or flat casting;

Fig. 2 shows in face view a portion of the casting made in the mold of Fig. 1;

, Fig. 3 is a transverse section of amold for producing a curved casting; parts being broken away; and

Fig. 4 shows a perspective View of a casting made in the mold of Fig. 3.

Referring to the drawings in detail, the

mold of Fig. 1 comprises a drag section 6'in which 1s placed a chill section 7, that is a section of metal such as cast iron. This chill section 7 is formed with recesses 8, which are filled with core sand 5, baked or dried therein, To the exposed surfaces of the sand fill.- ings are anchored lump's 9 of suitable wearresisting material, by means of any suitable adhesive. The mold is completed by a cope section 11, having the mold recess is filled with molten iron through the pour", ing gate 13. The lumps of abrasive material 9, being anchored securely to the sand fillings, will retain their proper or prearranged posi tions :during the flowing of the molten iron, 1

so that there is produced, as shown in Fig. 2, a flat chilled iron casting 14, having embedded therein the abrasive lumps or inserts 9 which are exposed at the chilled surface to protect the same from wear of abrading material passing thereover.

In Fig. 3 is illustrated a mold for making a pipe section or lining therefor and in which the mold is provided with a curved metal core or chill section 15 provided with recesses 8, sand fillings 5, and abrasive lumps 9. F ig. 4 shows a casting 16 made from this mold and having embedded therein the abrasive lum s or inserts-9 exposed at the inner chilled sur ace of the casting.

In Fig. 2 the abrasive lumps or inserts 9 are shown as arranged in transverse rows, being staggered as between the adjacent rows and inclined in opposite directions, and as thus arranged, they will afford the chilled surface of the casting when used, as intended, to resist wear of abrading particles passing longitudinally of the casting. It will be understood, however, that the abrasive lumps or inserts may be varied in side, shape and location to suit Whatever conditions are to be met, it being,evident that these conditions will differ in accordance with the different uses to which the castings are to be put. The sand recesses 8 formed in the chill sections may be varied likewise, although de- 12, which i good protection to stead, the essential idea umps.

ending to some extent upon the abrasive Thus, the recesses may be round, square, or in the form of grooves, and may be run transversely, longitudinally or diagonally or otherwise, across the face of the chill section, so long as they can function in the required manner. It may be desirable, in many instances to provide a separate sand recess for each abrasive lump and of as little area as possible, so as to reduce the total area of the sand inserts to the minimum and correspondingly to increase the total area of the metallic surface of the chill section. While ordinary core sand has been found most satisfactory for filling the chill recesses, any other material possessing like properties may be used inbeing to provide a bed of non-chill material for the anchorage of the abrasive elements in proper position within the mold.

In its broader aspects, the invention is not limited to the particular material or to the articular steps or modes of procedure herein specified by way of example, as many variations may be resorted to without departing from the main principles of the invention and without sacrificing its chief advantages.

We claim: I 1'. The method of casting chilled metal articles with wear-resisting inserts, which method consists in providing a mold with a permanent chill-section formed with recesses,-

filling said recesses with non-chill material, anchoring to said non-chill material the wearresisting elements, and pouring into the mold 1 the molten metal without incorporating the non-chill material in the resultant casting.

2. The method of casting a metal article having an exposed chilled surface with wearresisting inserts, providing a mold with a chill section arranged to produce said chilled surface and formed with recesses, filling said recesses with non-chill material, anchoring the wear-resisting elements to said non-chill material only, and pouring into the mold the molten metal.

3. The method of casting chilled metal articles with wear-resisting inserts, which meth- .od consists in providing a mold with achillsection formed with recesses,

filling said recesses with core sand, anchoring to the sand fillin s by a suitable adhesive lumps of wearresisting material, and pouring into the mold the molten metal.

In testimony whereof, I have aflixed my signature hereto.

RALPH S. EDMONDSON, In testimony whereof, I have afiixed my signature hereto.

EUGENE HAHN.

which method consists in 

